2 * Copyright (c) 2009, Microsoft Corporation.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 * K. Y. Srinivasan <kys@microsoft.com>
22 #include <linux/init.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/device.h>
26 #include <linux/blkdev.h>
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_cmnd.h>
29 #include <scsi/scsi_host.h>
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_tcq.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_devinfo.h>
34 #include <scsi/scsi_dbg.h>
37 #include "hyperv_storage.h"
39 static int storvsc_ringbuffer_size
= STORVSC_RING_BUFFER_SIZE
;
41 module_param(storvsc_ringbuffer_size
, int, S_IRUGO
);
42 MODULE_PARM_DESC(storvsc_ringbuffer_size
, "Ring buffer size (bytes)");
44 static const char *driver_name
= "storvsc";
46 /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
47 static const struct hv_guid gStorVscDeviceType
= {
49 0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
50 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
54 struct hv_host_device
{
55 struct hv_device
*dev
;
56 struct kmem_cache
*request_pool
;
62 struct storvsc_cmd_request
{
63 struct list_head entry
;
64 struct scsi_cmnd
*cmd
;
66 unsigned int bounce_sgl_count
;
67 struct scatterlist
*bounce_sgl
;
69 struct hv_storvsc_request request
;
73 static int storvsc_device_alloc(struct scsi_device
*sdevice
)
76 * This enables luns to be located sparsely. Otherwise, we may not
79 sdevice
->sdev_bflags
|= BLIST_SPARSELUN
| BLIST_LARGELUN
;
83 static int storvsc_merge_bvec(struct request_queue
*q
,
84 struct bvec_merge_data
*bmd
, struct bio_vec
*bvec
)
86 /* checking done by caller. */
90 static int storvsc_device_configure(struct scsi_device
*sdevice
)
92 scsi_adjust_queue_depth(sdevice
, MSG_SIMPLE_TAG
,
93 STORVSC_MAX_IO_REQUESTS
);
95 DPRINT_INFO(STORVSC_DRV
, "sdev (%p) - setting max segment size to %ld",
97 blk_queue_max_segment_size(sdevice
->request_queue
, PAGE_SIZE
);
99 DPRINT_INFO(STORVSC_DRV
, "sdev (%p) - adding merge bio vec routine",
101 blk_queue_merge_bvec(sdevice
->request_queue
, storvsc_merge_bvec
);
103 blk_queue_bounce_limit(sdevice
->request_queue
, BLK_BOUNCE_ANY
);
108 static void destroy_bounce_buffer(struct scatterlist
*sgl
,
109 unsigned int sg_count
)
112 struct page
*page_buf
;
114 for (i
= 0; i
< sg_count
; i
++) {
115 page_buf
= sg_page((&sgl
[i
]));
116 if (page_buf
!= NULL
)
117 __free_page(page_buf
);
123 static int do_bounce_buffer(struct scatterlist
*sgl
, unsigned int sg_count
)
127 /* No need to check */
131 /* We have at least 2 sg entries */
132 for (i
= 0; i
< sg_count
; i
++) {
134 /* make sure 1st one does not have hole */
135 if (sgl
[i
].offset
+ sgl
[i
].length
!= PAGE_SIZE
)
137 } else if (i
== sg_count
- 1) {
138 /* make sure last one does not have hole */
139 if (sgl
[i
].offset
!= 0)
142 /* make sure no hole in the middle */
143 if (sgl
[i
].length
!= PAGE_SIZE
|| sgl
[i
].offset
!= 0)
150 static struct scatterlist
*create_bounce_buffer(struct scatterlist
*sgl
,
151 unsigned int sg_count
,
156 struct scatterlist
*bounce_sgl
;
157 struct page
*page_buf
;
159 num_pages
= ALIGN(len
, PAGE_SIZE
) >> PAGE_SHIFT
;
161 bounce_sgl
= kcalloc(num_pages
, sizeof(struct scatterlist
), GFP_ATOMIC
);
165 for (i
= 0; i
< num_pages
; i
++) {
166 page_buf
= alloc_page(GFP_ATOMIC
);
169 sg_set_page(&bounce_sgl
[i
], page_buf
, 0, 0);
175 destroy_bounce_buffer(bounce_sgl
, num_pages
);
180 /* Assume the original sgl has enough room */
181 static unsigned int copy_from_bounce_buffer(struct scatterlist
*orig_sgl
,
182 struct scatterlist
*bounce_sgl
,
183 unsigned int orig_sgl_count
)
187 unsigned long src
, dest
;
188 unsigned int srclen
, destlen
, copylen
;
189 unsigned int total_copied
= 0;
190 unsigned long bounce_addr
= 0;
191 unsigned long dest_addr
= 0;
194 local_irq_save(flags
);
196 for (i
= 0; i
< orig_sgl_count
; i
++) {
197 dest_addr
= (unsigned long)kmap_atomic(sg_page((&orig_sgl
[i
])),
198 KM_IRQ0
) + orig_sgl
[i
].offset
;
200 destlen
= orig_sgl
[i
].length
;
202 if (bounce_addr
== 0)
204 (unsigned long)kmap_atomic(sg_page((&bounce_sgl
[j
])),
208 src
= bounce_addr
+ bounce_sgl
[j
].offset
;
209 srclen
= bounce_sgl
[j
].length
- bounce_sgl
[j
].offset
;
211 copylen
= min(srclen
, destlen
);
212 memcpy((void *)dest
, (void *)src
, copylen
);
214 total_copied
+= copylen
;
215 bounce_sgl
[j
].offset
+= copylen
;
219 if (bounce_sgl
[j
].offset
== bounce_sgl
[j
].length
) {
221 kunmap_atomic((void *)bounce_addr
, KM_IRQ0
);
224 /* if we need to use another bounce buffer */
225 if (destlen
|| i
!= orig_sgl_count
- 1)
227 (unsigned long)kmap_atomic(
228 sg_page((&bounce_sgl
[j
])), KM_IRQ0
);
229 } else if (destlen
== 0 && i
== orig_sgl_count
- 1) {
230 /* unmap the last bounce that is < PAGE_SIZE */
231 kunmap_atomic((void *)bounce_addr
, KM_IRQ0
);
235 kunmap_atomic((void *)(dest_addr
- orig_sgl
[i
].offset
),
239 local_irq_restore(flags
);
245 /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
246 static unsigned int copy_to_bounce_buffer(struct scatterlist
*orig_sgl
,
247 struct scatterlist
*bounce_sgl
,
248 unsigned int orig_sgl_count
)
252 unsigned long src
, dest
;
253 unsigned int srclen
, destlen
, copylen
;
254 unsigned int total_copied
= 0;
255 unsigned long bounce_addr
= 0;
256 unsigned long src_addr
= 0;
259 local_irq_save(flags
);
261 for (i
= 0; i
< orig_sgl_count
; i
++) {
262 src_addr
= (unsigned long)kmap_atomic(sg_page((&orig_sgl
[i
])),
263 KM_IRQ0
) + orig_sgl
[i
].offset
;
265 srclen
= orig_sgl
[i
].length
;
267 if (bounce_addr
== 0)
269 (unsigned long)kmap_atomic(sg_page((&bounce_sgl
[j
])),
273 /* assume bounce offset always == 0 */
274 dest
= bounce_addr
+ bounce_sgl
[j
].length
;
275 destlen
= PAGE_SIZE
- bounce_sgl
[j
].length
;
277 copylen
= min(srclen
, destlen
);
278 memcpy((void *)dest
, (void *)src
, copylen
);
280 total_copied
+= copylen
;
281 bounce_sgl
[j
].length
+= copylen
;
285 if (bounce_sgl
[j
].length
== PAGE_SIZE
) {
286 /* full..move to next entry */
287 kunmap_atomic((void *)bounce_addr
, KM_IRQ0
);
290 /* if we need to use another bounce buffer */
291 if (srclen
|| i
!= orig_sgl_count
- 1)
293 (unsigned long)kmap_atomic(
294 sg_page((&bounce_sgl
[j
])), KM_IRQ0
);
296 } else if (srclen
== 0 && i
== orig_sgl_count
- 1) {
297 /* unmap the last bounce that is < PAGE_SIZE */
298 kunmap_atomic((void *)bounce_addr
, KM_IRQ0
);
302 kunmap_atomic((void *)(src_addr
- orig_sgl
[i
].offset
), KM_IRQ0
);
305 local_irq_restore(flags
);
312 * storvsc_remove - Callback when our device is removed
314 static int storvsc_remove(struct hv_device
*dev
)
316 struct Scsi_Host
*host
= dev_get_drvdata(&dev
->device
);
317 struct hv_host_device
*host_dev
=
318 (struct hv_host_device
*)host
->hostdata
;
321 * Call to the vsc driver to let it know that the device is being
324 storvsc_dev_remove(dev
);
326 if (host_dev
->request_pool
) {
327 kmem_cache_destroy(host_dev
->request_pool
);
328 host_dev
->request_pool
= NULL
;
331 DPRINT_INFO(STORVSC
, "removing host adapter (%p)...", host
);
332 scsi_remove_host(host
);
334 DPRINT_INFO(STORVSC
, "releasing host adapter (%p)...", host
);
340 static int storvsc_get_chs(struct scsi_device
*sdev
, struct block_device
* bdev
,
341 sector_t capacity
, int *info
)
343 sector_t nsect
= capacity
;
344 sector_t cylinders
= nsect
;
345 int heads
, sectors_pt
;
348 * We are making up these values; let us keep it simple.
351 sectors_pt
= 0x3f; /* Sectors per track */
352 sector_div(cylinders
, heads
* sectors_pt
);
353 if ((sector_t
)(cylinders
+ 1) * heads
* sectors_pt
< nsect
)
357 info
[1] = sectors_pt
;
358 info
[2] = (int)cylinders
;
360 DPRINT_INFO(STORVSC_DRV
, "CHS (%d, %d, %d)", (int)cylinders
, heads
,
366 static int storvsc_host_reset(struct hv_device
*device
)
368 struct storvsc_device
*stor_device
;
369 struct hv_storvsc_request
*request
;
370 struct vstor_packet
*vstor_packet
;
373 DPRINT_INFO(STORVSC
, "resetting host adapter...");
375 stor_device
= get_stor_device(device
);
379 request
= &stor_device
->reset_request
;
380 vstor_packet
= &request
->vstor_packet
;
382 init_completion(&request
->wait_event
);
384 vstor_packet
->operation
= VSTOR_OPERATION_RESET_BUS
;
385 vstor_packet
->flags
= REQUEST_COMPLETION_FLAG
;
386 vstor_packet
->vm_srb
.path_id
= stor_device
->path_id
;
388 ret
= vmbus_sendpacket(device
->channel
, vstor_packet
,
389 sizeof(struct vstor_packet
),
390 (unsigned long)&stor_device
->reset_request
,
392 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
396 t
= wait_for_completion_timeout(&request
->wait_event
, HZ
);
402 DPRINT_INFO(STORVSC
, "host adapter reset completed");
405 * At this point, all outstanding requests in the adapter
406 * should have been flushed out and return to us
410 put_stor_device(device
);
416 * storvsc_host_reset_handler - Reset the scsi HBA
418 static int storvsc_host_reset_handler(struct scsi_cmnd
*scmnd
)
421 struct hv_host_device
*host_dev
=
422 (struct hv_host_device
*)scmnd
->device
->host
->hostdata
;
423 struct hv_device
*dev
= host_dev
->dev
;
425 DPRINT_INFO(STORVSC_DRV
, "sdev (%p) dev obj (%p) - host resetting...",
428 /* Invokes the vsc to reset the host/bus */
429 ret
= storvsc_host_reset(dev
);
433 DPRINT_INFO(STORVSC_DRV
, "sdev (%p) dev obj (%p) - host reseted",
441 * storvsc_commmand_completion - Command completion processing
443 static void storvsc_commmand_completion(struct hv_storvsc_request
*request
)
445 struct storvsc_cmd_request
*cmd_request
=
446 (struct storvsc_cmd_request
*)request
->context
;
447 struct scsi_cmnd
*scmnd
= cmd_request
->cmd
;
448 struct hv_host_device
*host_dev
=
449 (struct hv_host_device
*)scmnd
->device
->host
->hostdata
;
450 void (*scsi_done_fn
)(struct scsi_cmnd
*);
451 struct scsi_sense_hdr sense_hdr
;
452 struct vmscsi_request
*vm_srb
;
454 if (cmd_request
->bounce_sgl_count
) {
456 /* FIXME: We can optimize on writes by just skipping this */
457 copy_from_bounce_buffer(scsi_sglist(scmnd
),
458 cmd_request
->bounce_sgl
,
459 scsi_sg_count(scmnd
));
460 destroy_bounce_buffer(cmd_request
->bounce_sgl
,
461 cmd_request
->bounce_sgl_count
);
464 vm_srb
= &request
->vstor_packet
.vm_srb
;
465 scmnd
->result
= vm_srb
->scsi_status
;
468 if (scsi_normalize_sense(scmnd
->sense_buffer
,
469 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
))
470 scsi_print_sense_hdr("storvsc", &sense_hdr
);
473 scsi_set_resid(scmnd
,
474 request
->data_buffer
.len
-
475 vm_srb
->data_transfer_length
);
477 scsi_done_fn
= scmnd
->scsi_done
;
479 scmnd
->host_scribble
= NULL
;
480 scmnd
->scsi_done
= NULL
;
482 /* !!DO NOT MODIFY the scmnd after this call */
485 kmem_cache_free(host_dev
->request_pool
, cmd_request
);
490 * storvsc_queuecommand - Initiate command processing
492 static int storvsc_queuecommand_lck(struct scsi_cmnd
*scmnd
,
493 void (*done
)(struct scsi_cmnd
*))
496 struct hv_host_device
*host_dev
=
497 (struct hv_host_device
*)scmnd
->device
->host
->hostdata
;
498 struct hv_device
*dev
= host_dev
->dev
;
499 struct hv_storvsc_request
*request
;
500 struct storvsc_cmd_request
*cmd_request
;
501 unsigned int request_size
= 0;
503 struct scatterlist
*sgl
;
504 unsigned int sg_count
= 0;
505 struct vmscsi_request
*vm_srb
;
508 /* If retrying, no need to prep the cmd */
509 if (scmnd
->host_scribble
) {
512 (struct storvsc_cmd_request
*)scmnd
->host_scribble
;
513 DPRINT_INFO(STORVSC_DRV
, "retrying scmnd %p cmd_request %p",
519 scmnd
->scsi_done
= done
;
521 request_size
= sizeof(struct storvsc_cmd_request
);
523 cmd_request
= kmem_cache_zalloc(host_dev
->request_pool
,
526 scmnd
->scsi_done
= NULL
;
527 return SCSI_MLQUEUE_DEVICE_BUSY
;
530 /* Setup the cmd request */
531 cmd_request
->bounce_sgl_count
= 0;
532 cmd_request
->bounce_sgl
= NULL
;
533 cmd_request
->cmd
= scmnd
;
535 scmnd
->host_scribble
= (unsigned char *)cmd_request
;
537 request
= &cmd_request
->request
;
538 vm_srb
= &request
->vstor_packet
.vm_srb
;
542 switch (scmnd
->sc_data_direction
) {
544 vm_srb
->data_in
= WRITE_TYPE
;
546 case DMA_FROM_DEVICE
:
547 vm_srb
->data_in
= READ_TYPE
;
550 vm_srb
->data_in
= UNKNOWN_TYPE
;
554 request
->on_io_completion
= storvsc_commmand_completion
;
555 request
->context
= cmd_request
;/* scmnd; */
557 vm_srb
->port_number
= host_dev
->port
;
558 vm_srb
->path_id
= scmnd
->device
->channel
;
559 vm_srb
->target_id
= scmnd
->device
->id
;
560 vm_srb
->lun
= scmnd
->device
->lun
;
562 vm_srb
->cdb_length
= scmnd
->cmd_len
;
564 memcpy(vm_srb
->cdb
, scmnd
->cmnd
, vm_srb
->cdb_length
);
566 request
->sense_buffer
= scmnd
->sense_buffer
;
569 request
->data_buffer
.len
= scsi_bufflen(scmnd
);
570 if (scsi_sg_count(scmnd
)) {
571 sgl
= (struct scatterlist
*)scsi_sglist(scmnd
);
572 sg_count
= scsi_sg_count(scmnd
);
574 /* check if we need to bounce the sgl */
575 if (do_bounce_buffer(sgl
, scsi_sg_count(scmnd
)) != -1) {
576 cmd_request
->bounce_sgl
=
577 create_bounce_buffer(sgl
, scsi_sg_count(scmnd
),
578 scsi_bufflen(scmnd
));
579 if (!cmd_request
->bounce_sgl
) {
580 scmnd
->scsi_done
= NULL
;
581 scmnd
->host_scribble
= NULL
;
582 kmem_cache_free(host_dev
->request_pool
,
585 return SCSI_MLQUEUE_HOST_BUSY
;
588 cmd_request
->bounce_sgl_count
=
589 ALIGN(scsi_bufflen(scmnd
), PAGE_SIZE
) >>
593 * FIXME: We can optimize on reads by just skipping
596 copy_to_bounce_buffer(sgl
, cmd_request
->bounce_sgl
,
597 scsi_sg_count(scmnd
));
599 sgl
= cmd_request
->bounce_sgl
;
600 sg_count
= cmd_request
->bounce_sgl_count
;
603 request
->data_buffer
.offset
= sgl
[0].offset
;
605 for (i
= 0; i
< sg_count
; i
++)
606 request
->data_buffer
.pfn_array
[i
] =
607 page_to_pfn(sg_page((&sgl
[i
])));
609 } else if (scsi_sglist(scmnd
)) {
610 request
->data_buffer
.offset
=
611 virt_to_phys(scsi_sglist(scmnd
)) & (PAGE_SIZE
-1);
612 request
->data_buffer
.pfn_array
[0] =
613 virt_to_phys(scsi_sglist(scmnd
)) >> PAGE_SHIFT
;
617 /* Invokes the vsc to start an IO */
618 ret
= storvsc_do_io(dev
, &cmd_request
->request
);
623 if (cmd_request
->bounce_sgl_count
) {
625 * FIXME: We can optimize on writes by just skipping
628 copy_from_bounce_buffer(scsi_sglist(scmnd
),
629 cmd_request
->bounce_sgl
,
630 scsi_sg_count(scmnd
));
631 destroy_bounce_buffer(cmd_request
->bounce_sgl
,
632 cmd_request
->bounce_sgl_count
);
635 kmem_cache_free(host_dev
->request_pool
, cmd_request
);
637 scmnd
->scsi_done
= NULL
;
638 scmnd
->host_scribble
= NULL
;
640 ret
= SCSI_MLQUEUE_DEVICE_BUSY
;
646 static DEF_SCSI_QCMD(storvsc_queuecommand
)
650 static struct scsi_host_template scsi_driver
= {
651 .module
= THIS_MODULE
,
652 .name
= "storvsc_host_t",
653 .bios_param
= storvsc_get_chs
,
654 .queuecommand
= storvsc_queuecommand
,
655 .eh_host_reset_handler
= storvsc_host_reset_handler
,
656 .slave_alloc
= storvsc_device_alloc
,
657 .slave_configure
= storvsc_device_configure
,
659 /* 64 max_queue * 1 target */
660 .can_queue
= STORVSC_MAX_IO_REQUESTS
*STORVSC_MAX_TARGETS
,
662 /* no use setting to 0 since ll_blk_rw reset it to 1 */
664 .sg_tablesize
= MAX_MULTIPAGE_BUFFER_COUNT
,
666 * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge
667 * into 1 sg element. If set, we must limit the max_segment_size to
668 * PAGE_SIZE, otherwise we may get 1 sg element that represents
671 /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */
672 .use_clustering
= ENABLE_CLUSTERING
,
673 /* Make sure we dont get a sg segment crosses a page boundary */
674 .dma_boundary
= PAGE_SIZE
-1,
679 * storvsc_probe - Add a new device for this driver
682 static int storvsc_probe(struct hv_device
*device
)
685 struct Scsi_Host
*host
;
686 struct hv_host_device
*host_dev
;
687 struct storvsc_device_info device_info
;
689 host
= scsi_host_alloc(&scsi_driver
,
690 sizeof(struct hv_host_device
));
694 dev_set_drvdata(&device
->device
, host
);
696 host_dev
= (struct hv_host_device
*)host
->hostdata
;
697 memset(host_dev
, 0, sizeof(struct hv_host_device
));
699 host_dev
->port
= host
->host_no
;
700 host_dev
->dev
= device
;
702 host_dev
->request_pool
=
703 kmem_cache_create(dev_name(&device
->device
),
704 sizeof(struct storvsc_cmd_request
), 0,
705 SLAB_HWCACHE_ALIGN
, NULL
);
707 if (!host_dev
->request_pool
) {
712 device_info
.port_number
= host
->host_no
;
713 device_info
.ring_buffer_size
= storvsc_ringbuffer_size
;
714 /* Call to the vsc driver to add the device */
715 ret
= storvsc_dev_add(device
, (void *)&device_info
);
718 kmem_cache_destroy(host_dev
->request_pool
);
723 host_dev
->path
= device_info
.path_id
;
724 host_dev
->target
= device_info
.target_id
;
726 /* max # of devices per target */
727 host
->max_lun
= STORVSC_MAX_LUNS_PER_TARGET
;
728 /* max # of targets per channel */
729 host
->max_id
= STORVSC_MAX_TARGETS
;
730 /* max # of channels */
731 host
->max_channel
= STORVSC_MAX_CHANNELS
- 1;
733 /* Register the HBA and start the scsi bus scan */
734 ret
= scsi_add_host(host
, &device
->device
);
737 storvsc_dev_remove(device
);
739 kmem_cache_destroy(host_dev
->request_pool
);
744 scsi_scan_host(host
);
748 /* The one and only one */
750 static struct hv_driver storvsc_drv
= {
751 .probe
= storvsc_probe
,
752 .remove
= storvsc_remove
,
757 * storvsc_drv_init - StorVsc driver initialization.
759 static int storvsc_drv_init(void)
762 struct hv_driver
*drv
= &storvsc_drv
;
763 u32 max_outstanding_req_per_channel
;
766 * Divide the ring buffer data size (which is 1 page less
767 * than the ring buffer size since that page is reserved for
768 * the ring buffer indices) by the max request size (which is
769 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
772 max_outstanding_req_per_channel
=
773 ((storvsc_ringbuffer_size
- PAGE_SIZE
) /
774 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET
+
775 sizeof(struct vstor_packet
) + sizeof(u64
),
778 memcpy(&drv
->dev_type
, &gStorVscDeviceType
,
779 sizeof(struct hv_guid
));
781 if (max_outstanding_req_per_channel
<
782 STORVSC_MAX_IO_REQUESTS
)
785 drv
->name
= driver_name
;
786 drv
->driver
.name
= driver_name
;
789 /* The driver belongs to vmbus */
790 ret
= vmbus_child_driver_register(&drv
->driver
);
795 static void storvsc_drv_exit(void)
797 vmbus_child_driver_unregister(&storvsc_drv
.driver
);
800 static int __init
storvsc_init(void)
804 DPRINT_INFO(STORVSC_DRV
, "Storvsc initializing....");
805 ret
= storvsc_drv_init();
809 static void __exit
storvsc_exit(void)
814 MODULE_LICENSE("GPL");
815 MODULE_VERSION(HV_DRV_VERSION
);
816 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
817 module_init(storvsc_init
);
818 module_exit(storvsc_exit
);